283 lines
9.8 KiB
Lua
283 lines
9.8 KiB
Lua
local opts = {
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drag_to_pan_margin = 50,
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drag_to_pan_move_if_full_view = false,
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pan_follows_cursor_margin = 50,
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cursor_centric_zoom_margin = 50,
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cursor_centric_zoom_auto_center = true,
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cursor_centric_zoom_dezoom_if_full_view = false,
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}
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local options = require 'mp.options'
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local msg = require 'mp.msg'
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local assdraw = require 'mp.assdraw'
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options.read_options(opts, nil, function() end)
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function clamp(value, low, high)
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if value <= low then
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return low
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elseif value >= high then
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return high
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else
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return value
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end
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end
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local cleanup = nil -- function set up by drag-to-pan/pan-follows cursor and must be called to clean lingering state
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function drag_to_pan_handler(table)
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if cleanup then
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cleanup()
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cleanup = nil
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end
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if table["event"] == "down" then
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local mouse_pos_origin, video_pan_origin = {}, {}
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local moved = false
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mouse_pos_origin[1], mouse_pos_origin[2] = mp.get_mouse_pos()
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video_pan_origin[1] = mp.get_property_number("video-pan-x")
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video_pan_origin[2] = mp.get_property_number("video-pan-y")
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local video_size = { dim.w - dim.ml - dim.mr, dim.h - dim.mt - dim.mb }
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local margin = opts.drag_to_pan_margin
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local move_up = true
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local move_lateral = true
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if not opts.drag_to_pan_move_if_full_view then
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if dim.ml >= 0 and dim.mr >= 0 then
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move_lateral = false
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end
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if dim.mt >= 0 and dim.mb >= 0 then
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move_up = false
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end
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end
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if not move_up and not move_lateral then return end
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local idle = function()
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if moved then
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local mX, mY = mp.get_mouse_pos()
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local pX = video_pan_origin[1]
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local pY = video_pan_origin[2]
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if move_lateral then
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pX = video_pan_origin[1] + (mX - mouse_pos_origin[1]) / video_size[1]
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if 2 * margin > dim.ml + dim.mr then
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pX = clamp(pX,
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(-margin + dim.w / 2) / video_size[1] - 0.5,
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(margin - dim.w / 2) / video_size[1] + 0.5)
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else
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pX = clamp(pX,
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(margin - dim.w / 2) / video_size[1] + 0.5,
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(-margin + dim.w / 2) / video_size[1] - 0.5)
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end
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end
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if move_up then
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pY = video_pan_origin[2] + (mY - mouse_pos_origin[2]) / video_size[2]
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if 2 * margin > dim.mt + dim.mb then
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pY = clamp(pY,
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(-margin + dim.h / 2) / video_size[2] - 0.5,
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(margin - dim.h / 2) / video_size[2] + 0.5)
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else
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pY = clamp(pY,
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(margin - dim.h / 2) / video_size[2] + 0.5,
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(-margin + dim.h / 2) / video_size[2] - 0.5)
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end
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end
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mp.command("no-osd set video-pan-x " .. clamp(pX, -3, 3) .. "; no-osd set video-pan-y " .. clamp(pY, -3, 3))
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moved = false
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end
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end
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mp.register_idle(idle)
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mp.add_forced_key_binding("mouse_move", "image-viewer-mouse-move", function() moved = true end)
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cleanup = function()
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mp.remove_key_binding("image-viewer-mouse-move")
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mp.unregister_idle(idle)
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end
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end
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end
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function pan_follows_cursor_handler(table)
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if cleanup then
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cleanup()
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cleanup = nil
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end
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if table["event"] == "down" then
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local video_size = { dim.w - dim.ml - dim.mr, dim.h - dim.mt - dim.mb }
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local moved = true
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local idle = function()
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if moved then
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local mX, mY = mp.get_mouse_pos()
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local x = math.min(1, math.max(-2 * mX / dim.w + 1, -1))
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local y = math.min(1, math.max(-2 * mY / dim.h + 1, -1))
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local command = ""
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local margin = opts.pan_follows_cursor_margin
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if dim.ml + dim.mr < 0 then
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command = command ..
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"no-osd set video-pan-x " .. clamp(x * (2 * margin - dim.ml - dim.mr) / (2 * video_size[1]), -3, 3) .. ";"
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elseif mp.get_property_number("video-pan-x") ~= 0 then
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command = command .. "no-osd set video-pan-x " .. "0;"
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end
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if dim.mt + dim.mb < 0 then
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command = command ..
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"no-osd set video-pan-y " .. clamp(y * (2 * margin - dim.mt - dim.mb) / (2 * video_size[2]), -3, 3) .. ";"
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elseif mp.get_property_number("video-pan-y") ~= 0 then
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command = command .. "no-osd set video-pan-y " .. "0;"
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end
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if command ~= "" then
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mp.command(command)
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end
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moved = false
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end
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end
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mp.register_idle(idle)
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mp.add_forced_key_binding("mouse_move", "image-viewer-mouse-move", function() moved = true end)
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cleanup = function()
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mp.remove_key_binding("image-viewer-mouse-move")
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mp.unregister_idle(idle)
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end
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end
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end
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function cursor_centric_zoom_handler(amt)
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local zoom_inc = tonumber(amt)
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if not zoom_inc or zoom_inc == 0 then return end
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local margin = opts.cursor_centric_zoom_margin
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local video_size = { dim.w - dim.ml - dim.mr, dim.h - dim.mt - dim.mb }
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-- the size in pixels of the (in|de)crement
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local diff_width = (2 ^ zoom_inc - 1) * video_size[1]
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local diff_height = (2 ^ zoom_inc - 1) * video_size[2]
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if not opts.cursor_centric_zoom_dezoom_if_full_view and
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zoom_inc < 0 and
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video_size[1] + diff_width + 2 * margin <= dim.w and
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video_size[2] + diff_height + 2 * margin <= dim.h
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then
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-- the zoom decrement is too much, reduce it such that the full image is visible, no more, no less
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-- in addition, this should take care of trying too zoom out while everything is already visible
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local new_zoom_inc_x = math.log((dim.w - 2 * margin) / video_size[1]) / math.log(2)
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local new_zoom_inc_y = math.log((dim.h - 2 * margin) / video_size[2]) / math.log(2)
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local new_zoom_inc = math.min(0, math.min(new_zoom_inc_x, new_zoom_inc_y))
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zoom_inc = new_zoom_inc
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diff_width = (2 ^ zoom_inc - 1) * video_size[1]
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diff_height = (2 ^ zoom_inc - 1) * video_size[2]
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end
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local new_width = video_size[1] + diff_width
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local new_height = video_size[2] + diff_height
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local mouse_pos_origin = {}
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mouse_pos_origin[1], mouse_pos_origin[2] = mp.get_mouse_pos()
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local new_pan_x, new_pan_y
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-- some additional constraints:
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-- if image can be fully visible (in either direction), set pan to 0
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-- if border would show on either side, then prefer adjusting the pan even if not cursor-centric
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local auto_c = opts.cursor_centric_zoom_auto_center
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if auto_c and video_size[1] + diff_width + 2 * margin <= dim.w then
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new_pan_x = 0
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else
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local pan_x = mp.get_property("video-pan-x")
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local rx = (dim.ml + video_size[1] / 2 - mouse_pos_origin[1]) / (video_size[1] / 2)
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new_pan_x = (pan_x * video_size[1] + rx * diff_width / 2) / new_width
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if auto_c then
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new_pan_x = clamp(new_pan_x, (dim.w - 2 * margin) / (2 * new_width) - 0.5,
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-(dim.w - 2 * margin) / (2 * new_width) + 0.5)
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end
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end
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if auto_c and video_size[2] + diff_height + 2 * margin <= dim.h then
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new_pan_y = 0
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else
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local pan_y = mp.get_property("video-pan-y")
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local ry = (dim.mt + video_size[2] / 2 - mouse_pos_origin[2]) / (video_size[2] / 2)
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new_pan_y = (pan_y * video_size[2] + ry * diff_height / 2) / new_height
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if auto_c then
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new_pan_y = clamp(new_pan_y, (dim.h - 2 * margin) / (2 * new_height) - 0.5,
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-(dim.h - 2 * margin) / (2 * new_height) + 0.5)
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end
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end
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local zoom_origin = mp.get_property("video-zoom")
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mp.command("no-osd set video-zoom " ..
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zoom_origin + zoom_inc ..
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"; no-osd set video-pan-x " .. clamp(new_pan_x, -3, 3) .. "; no-osd set video-pan-y " .. clamp(new_pan_y, -3, 3))
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end
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function align_border(x, y)
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local video_size = { dim.w - dim.ml - dim.mr, dim.h - dim.mt - dim.mb }
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local x, y = tonumber(x), tonumber(y)
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local command = ""
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if x then
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command = command .. "no-osd set video-pan-x " .. clamp(-x * (dim.ml + dim.mr) / (2 * video_size[1]), -3, 3) .. ";"
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end
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if y then
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command = command .. "no-osd set video-pan-y " .. clamp(-y * (dim.mt + dim.mb) / (2 * video_size[2]), -3, 3) .. ";"
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end
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if command ~= "" then
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mp.command(command)
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end
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end
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function pan_image(axis, amount, zoom_invariant, image_constrained)
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amount = tonumber(amount)
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if not amount or amount == 0 or axis ~= "x" and axis ~= "y" then return end
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if zoom_invariant == "yes" then
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amount = amount / 2 ^ mp.get_property_number("video-zoom")
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end
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local prop = "video-pan-" .. axis
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local old_pan = mp.get_property_number(prop)
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if image_constrained == "yes" then
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local margin =
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(axis == "x" and amount > 0) and dim.ml
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or (axis == "x" and amount < 0) and dim.mr
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or (amount > 0) and dim.mt
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or (amount < 0) and dim.mb
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local vid_size = (axis == "x") and (dim.w - dim.ml - dim.mr) or (dim.h - dim.mt - dim.mb)
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local pixels_moved = math.abs(amount) * vid_size
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-- the margin is already visible, no point going further
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if margin >= 0 then
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return
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elseif margin + pixels_moved > 0 then
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amount = -(math.abs(amount) / amount) * margin / vid_size
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end
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end
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mp.set_property_number(prop, old_pan + amount)
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end
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function rotate_video(amt)
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local rot = mp.get_property_number("video-rotate")
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rot = (rot + amt) % 360
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mp.set_property_number("video-rotate", rot)
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end
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function reset_pan_if_visible()
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local dim = mp.get_property_native("osd-dimensions")
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if not dim then return end
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local command = ""
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if (dim.ml + dim.mr >= 0) then
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command = command .. "no-osd set video-pan-x 0" .. ";"
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end
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if (dim.mt + dim.mb >= 0) then
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command = command .. "no-osd set video-pan-y 0" .. ";"
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end
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if command ~= "" then
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mp.command(command)
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end
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end
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mp.add_key_binding(nil, "drag-to-pan", drag_to_pan_handler, { complex = true })
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mp.add_key_binding(nil, "pan-follows-cursor", pan_follows_cursor_handler, { complex = true })
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mp.add_key_binding(nil, "cursor-centric-zoom", cursor_centric_zoom_handler)
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mp.add_key_binding(nil, "align-border", align_border)
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mp.add_key_binding(nil, "pan-image", pan_image)
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mp.add_key_binding(nil, "rotate-video", rotate_video)
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mp.add_key_binding(nil, "reset-pan-if-visible", reset_pan_if_visible)
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mp.add_key_binding(nil, "force-print-filename", force_print_filename)
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